Motor-driven hand-tool.



No. 352.258. PATENTED APR. 30, 1907.

COLLINS L M. HBARN.

MOTOR DRIVBN HAND TOOL.

APPLICATION FILED JUNE 20, 1905.

ELVIN COLLTNS AND MARK HEARN, OF MAITLAND, COLORADO.

MOTOR-Drawers HAND-Tool..

Specification of Letters '.Euatent.

Patented .April 30, 1907.

Application filed June Z0, 1905. Serial No. 266,194.

' clear, and exact description.

Our invention4 relates' to motor driven hand tools, but more particularly to a type oi hand tool operated by means of an electric motor and capable of serving various usefulpurposes, such as that of a hand saw,v a grind stone, an ernery wheel, or the like.

Retercnce is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the iigures. Figure l. is a perspective view showing our invention in use; and F ig. .2 is a fragmentary side elevation of the motor mechanism, a grind stone being substituted for the saw.

The motor is shown at 3 and is provided with a handle 4 whereby it may be manipulated somewhat after the manner of a hand saw. An eye 5 is connected rigidly with the motor, and secured to this eye is a cord which passes over pulleys 7, 8 and is connected with aeounterweight @which balances the motor 3. j The saw is shown at l() and is mounted rigidly upon the armature shaft 12 of the motor 3. if desired., instead of the saw 1U a grind-stone 11, or any analogous revolubl'i member, such as a brush wheel or an cmery wheel, may be substituted. The electric wires 13, 11.1. are used for energizing the motor in the usual manner.

Ouri vention is used as follows'z--lhe mooi; 3 being energized in the usual ',rnanner, he operator grasps the handle e and so nianipuiates it as 'to press the saw 10 into engagement with the part to be operated upon. ifoi' instance, if the device is used in a butcher Shop, the saw 1U is at the proper inoniient pressed into engagement with the bone to be sawed, the revolution of the saw inaking the cut, while the handle t is manipulated merely for the purpose of guiding the saw. The operator does not sustain the weight of the motor, or of any part thereof, for the reason that the same is supported by the counterweight 9. The operator can m'rlve the motor upward or downward at w1 ln F ie. 2 a grind stone l1 takes the place of the saw l0. This grind-stone may be used for any purpose, for instance, for sharpening any edged tool or for dressing any surface usually treated 'by the rotation of a grindstone.

We do not limit ourselves to any particular type of revoluble tool to be mounted upon l Neither do we limit vourselves to the particular means shown for the armature shaft 12.

balancing the motor, nor for guiding the revoluble tool. i

Having thus described our invention, we claim as new and desire to secure by Letters Patentz i A motor driven hand tool comprising an anti-friction support, a cable arranged on said support and having end portions depending from the same, an electric motor having a easing connected to and depending from one end, portion of the cable and also having a horizontal armature shaft journaled in and extending laterally. from said casing, a vertically-disposed, rotating tool i'ixed on the extended portion of the armature .shaft and arranged at one side of the casing, a handle fixed to and extending rearward from the casing and arranged in a plane parallel to,A

that oV f the rotating tool, and a counterweight donnected to the other end portion of the cable and balancing the motor casing and the parts carried thereby.

in testimony whereof we have signed ournames to this specification in the presence of two subscribing witnesses,

ELVIN COLLINS. MARK llEARN. Vitnesses:

llUGii ltmGwAr, WALTER T. EDWARDS. 

